520 Forestry Quarterly. 



on very limy sandstones and marl, if these are rich in potash or 

 silicates rich in Kalium. On the other hand, lime may counteract 

 the poisonous effect of magnesium and potash salts. Apparently 

 all the evidence seems to show that not the quantity of lime pres- 

 ent but the relation of lime to other minerals is the important 

 feature determining its effect. According to Loew, Cryptomeria, 

 Thuya, Pinus densi flora succeed in limestone if the quantities of 

 magnesia present are small ; and the favorable relation of these 

 varies with different plants. 



Lime under circumstances impedes water absorption consider- 

 ably, whereby also the absorption of minerals is changed. Al- 

 together, the lime problem remains still unsolved. 



An interesting statement, which lends color to the assertion of 

 the reviewer — that the physical condition of most limestone for- 

 mations in connection with the root system has at least for 

 arborescent forms the most important influence — is that the calco- 

 fuge Chestnut will grow well on limestone if grafted on oak 

 roots. 



Einfluss dcs Kalkes auf das Wachstuni der Pflanzen. Zeitschrift fur 

 Forst-und Jagdwesen. May, 1912. Pp. 316-330. 



SILVICULTURE, PROTECTION AND EXTENSION. 



In a book of 115 pages, Professor Cajander, 



Type of Helsingfors, proposes to make the three 



Classification following main forest types for Germany 



named after prominent plants in the ground 



cover : 



1. Oxalis type. 



2. Myrtillus type. 



3. Calluna type. 



Subtypes under each type are distinguished which are to be 

 made the basis for description and management, and especially for 

 the construction of yield tables, each type varying in regard to 

 increment while also a maximum height in each is typical. 



Ueher Waldtypen. Forstwiss. Centralblatt. Feb., 1912. Pp. 99-102. 



